/* -*-c++-*- */
/* osgGIS - GIS Library for OpenSceneGraph
 * Copyright 2007-2008 Glenn Waldron and Pelican Ventures, Inc.
 * http://osggis.org
 *
 * osgGIS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef _OSGGIS_REMOVE_HOLES_FILTER_H_
#define _OSGGIS_REMOVE_HOLES_FILTER_H_ 1

#include <osgGIS/Common>
#include <osgGIS/FeatureFilter>

namespace osgGIS
{
    /**
     * A Feature Filter that removes "holes" (i.e. counter-wound parts) from polygon
     * features.
     *
     * A Polygon feature may actually consist of multiple polygons. The vertex winding
     * determines whether each poly is a surface or a hole in another surface. This filter
     * removes the parts that are determined to be holes.
     */
    class OSGGIS_EXPORT RemoveHolesFilter : public FeatureFilter
    {
        OSGGIS_META_FILTER( RemoveHolesFilter ); 

    public:
        /**
         * Constructs a new hole-removing filter
         */
        RemoveHolesFilter();

        /**
         * Copy constructor
         */
        RemoveHolesFilter( const RemoveHolesFilter& rhs );
        
        virtual ~RemoveHolesFilter();
        
    public:
        FeatureList process( Feature* input, FilterEnv* env );
    };
}

#endif // _OSGGIS_REMOVE_HOLES_FILTER_H_
